You may remember the most common ones like HTTP, FTP, SSH but if you are working on various technology stacks then it’s difficult to remember all of them. Here I have listed the default port numbers of various applications to help you in the real world.

Application/Web Servers

Well-Known Common Protocols

Database/Datastore

Messaging/Transfer

Misc

Here is an infographic version which you can download or share with your friends. Some of the abbreviations used in the above list

WAS – WebSphere Application Server AJP – Apache JServ Protocol SSL – Secure Socket Layer HTTP – HyperText Transfer Protocol LDAP – Lightweight Directory Access Protocol SSH – Secure Shell SMTP – Simple Mail Transfer Protocol IHS – IBM HTTP Server NNTP – Network News Transport Protocol SNMP – Simple Network Management Protocol

I hope this cheat sheet helps you as a reference guide at your work. If you are looking to upgrade your skills then check out thousands of online courses here.

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